Process for removing slags from furnaces and means for carrying out the same.



KARL PRINZ ZU LOEWENSTEIN.

PROCESS FOR REMOVING SLAGS FROM FURNACES AND MEANS FOR CARRYING OUT THESAME. APPLICATION FILE-I) NOV. 25, 1912.

1,128,255. Patented Feb. 9,1915.

WITN $5 ES 'NVENTOR KARL PRINZ zu LOEWENSTEIN:

ATTORNEY THE NORRIS PETERS 60.. PHOTc-LITHQ, WASHINGTON. D. C.

- burn downward through the grate.

UNITED STATES PATENT @FFTQE.

KARL PRINZ ZU LOEWENSTEIN, OF NECKARGEMTTND, GERMANY.

PROCESS FOR REMOVING SLAGS FROM FURNACES AND MEANS FOR CARRYING OUT THESAME.

Specification of Letters Patent.

Patented Feb. 9, 1915.

Application filed November 25, 1912. Serial No. 733,551.

To all whom it may concern Be it known that I, KARL PRINZ ZU LoEw-ENSTEIN, a citizen of the German'Empire, residing at Neckargemiind, inthe Grand Dukedom of Baden, Germany,haveinvented certain new and usefulImprovements in Processes for Removing Slags from Furnaces and Means forCarrying Out the Same; and Ido hereby declare the following to be afull, clear, and eXact description of the invention, such as will enableothers skilled in the art to which it appertains to make and use thesame.

The invention relates to a new process for removing the slags fromfurnaces and more especially from furnaces of that kind, in which theflames and gases of combusi alipln e slags must be removed after acertain time of working and this must be repeated in certainpredetermined intervals. This cleaning of the grate, if done in theusual manner, offers considerable inconveniences and many disadvantagesfor the working. For instance the layer of coals must burn down sodeeply, that the grate-bars nearly become free. The thin layer remainingupon the grate is no more covered with freshly inserted black coals, i.e. not yet burning coals and is moreover in incandescent condition; theheat radiating against the stoker, when taking away the slags, istherefore nearly unbearable and his work so hard and troublesome, thatoften it is not done with sufficient care. The difficulty of the work isstill increased by the reason, that the slags must be lifted and thatsmall pieces only can be removed at the time, on account of the softcondition of the slags. Besides it may happen that the fire isextinguished completely and must be relighted, which causes a longinterruption and delay of the working.

Now it has been known in furnaces with upward burning flames to drivegrate-bars transversely into the shaft of the furnace for the purpose ofcleaning the grate and removing the slags; but it has not yet beentried, to use this false grate also in furnaces with downward burningflames, on account of the great difficulties, which must be overcome inorder to remove the slags from furnaces of this kind. Especially theinconvenience in the known device, that the cleaning of the real gratemust be carried out immediately after the insertion of the false gratein order to prevent this latter from being burned, which causes aninterruption of the working, renders impossible the employment of thefalse grate in furnaces with downward burning flames.

The new process permits the removal of the slags without special effortfor the stoker and without the danger of an interruption of the working.For this purpose a space is produced above the grate before removal ofthe slags, so that the grate is free and the slags may easily beremoved, whereas the fuel above burns as before. The best way to obtainthis end is to separate a certain, suitably thin layer above the grateand burn out the same separated from the rest of the fuel,

so that the grate lies free. The separation true grate of furnaces withdownward burning flames of a system of tubes that are passed by aliquid. After some time the coals between the grates will be burned andthe slags lying on the true grate may be taken away by the stokerwithout special difficulty and without interruption of the working. Ifthe slags are cleaned away, the false grate is drawn back again.

Means for carrying out this process are illustrated in the accompanyingdrawing, in which- Figure 1 is a vertical section of a furnace providedwith the improvement, Figs. 26 are plan views of various forms of thefalse grate and the true grate.

The furnace a and the water cooled true grate b are of the usualconstruction. According to the present invention, some time before theslags are to be removed, a false grate 0 is introduced above the grateb; the two grates having suitably only a small distance between them(Fig. 1). If the coals lying between the two grates c and b are burned,the slags on the grate b can easily be removed laterally through doorsand other suitable apertures.

The tubes of the false grate 0 connect with cooling coils h surroundedby a container k. The cooling coils 0 may be kept cool by a coolingfluid in the container 70 or in any suitable manner.

In the form of execution shown in Fig. 2 every bar of the false grate 6consists of an internal tube d which is situated in an external tube e.The colder liquid passes firstly through the inner tube (Z and thenenters into the external tube 6.

Figs. 8 and a are modified forms of the false grate, in which the falsegrate consists of separate tube-elements 7 that may be simply orrepeatedly bent.

The forms of execution shown in Figs. 5 and '6 illustrate constructionsof the true grate b, the grate bars being suitably constructed in themanner shown in Fig. 2.

Having now particularly described and ascertained my invention, Ideclare that what I claim is:

1. In a down draft furnace, the combination, with the furnace and thetrue grate thereof, a false grate adapted to be moved into slightlyspaced relation with and above the true grate, and means for cooling thefalse grate.

2. In a down draft furnace, the combination, with the furnace and thetrue grate thereof, a false grate adapted to be moved into slightlyspaced relation with and above the true grate, and means movable withthe false grate for supplying a cooling liquid to the interior of thefalse grate.

3. In a furnace, the combination, with the furnace and the true gratethereof, of a tubular false grate adapted to be moved into slightlyspaced relation with and above said true grate, and means movable withthe false grate for introducing a cooling liquid into the tubes of thefalse grate.

4c. In a furnace, the combination, with the furnace and the true gratethereof, of a tubular false grate adapted to be moved into slightlyspaced relation with and above said true grate, means movable with thefalse grate for introducing a cooling liquid into the tubes of the falsegrate, and a door in the furnace at the end of the space between thegrates.

5. In a down draft furnace, the combination of a stationary water-cooledtrue grate sloping toward the forward end of the furnace; a tubularfalse grate adapted to be moved into slightly spaced relation with andabove the true grate; a coil communicating with the tubes of the falsegrate; and a tanksurrounding the coil, said tank, coil and false gratebeing connected with each other and all adapted to move together at thesame time.

6. In a .down draft furnace, the combination of a movable tank; a coilwithin said tank and movable therewith; a grate movable with said coiland tank and movable pipes connecting said coil and grate and movabletherewith.

7. In a down draft furnace, the combination of a movable tank; a coil insaid tank and movable therewith; and a movable grate connected with thecoils, said coil, tank and grate being movable together a distancesubstantially equal to the length of the false grate.

8. In a down draft furnace, the combination of a stationary water cooledtrue grate sloping toward the forward end of the furnace and havingupturned inner ends; a tubular false grate adapted to be moved intoslightly spaced relation with and above the true grate; a coilcommunicating with the tubes of the false grate; and a tank surroundingthe coil, said tank, coil and false grate being connected with eachother and all adapted to move together at the same time a distancesubstantially equal to the length of the false grate.

In testimony whereof I affix my signature in presence of two witnesses.

KARL PRINZ z LOEWENS'IEIN.

Witnesses GEoRG LEHNER, WILHELM NIKEL.

Copies of this patent may be obtained for five cents each, by addressingthe Commissioner of Eatents,

Washington, D G.

